CVE-2025-66150
📋 TL;DR
This CVE describes a Missing Authorization vulnerability in the merkulove Appender WordPress plugin that allows attackers to exploit incorrectly configured access control security levels. Attackers can potentially perform unauthorized actions that should require proper authentication. This affects all WordPress sites running Appender plugin versions up to and including 1.1.1.
💻 Affected Systems
- merkulove Appender WordPress Plugin
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Attackers could modify plugin settings, inject malicious content, or perform administrative actions without authentication, potentially leading to site compromise or data manipulation.
Likely Case
Unauthorized users could modify plugin configurations, potentially disrupting site functionality or injecting unwanted content.
If Mitigated
With proper access controls and authentication requirements, the vulnerability would be prevented from being exploited.
🎯 Exploit Status
The vulnerability involves missing authorization checks, making exploitation straightforward once the attack vector is identified.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 1.1.1
Vendor Advisory: https://patchstack.com/database/wordpress/plugin/appender/vulnerability/wordpress-appender-plugin-1-1-1-broken-access-control-vulnerability?_s_id=cve
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'Appender' plugin. 4. Click 'Update Now' if update available. 5. If no update available, deactivate and remove plugin until patched version is released.
🔧 Temporary Workarounds
Disable Appender Plugin
allTemporarily deactivate the vulnerable plugin until patched version is available
wp plugin deactivate appender
Restrict Access to WordPress Admin
allImplement IP whitelisting or additional authentication for WordPress admin interface
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block unauthorized access to Appender plugin endpoints
- Enable WordPress security plugins that monitor and block suspicious authentication bypass attempts
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel → Plugins → Installed Plugins → Appender version. If version is 1.1.1 or earlier, you are vulnerable.Check Version:
wp plugin get appender --field=versionVerify Fix Applied:
After updating, verify Appender plugin version is higher than 1.1.1 in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts to Appender plugin endpoints in WordPress logs
- Multiple failed authentication attempts followed by successful Appender-related actions
Network Indicators:
- Unusual HTTP requests to /wp-content/plugins/appender/ endpoints without proper authentication headers
SIEM Query:
source="wordpress.log" AND (uri_path="/wp-content/plugins/appender/" OR plugin="appender") AND (response_code=200 OR response_code=302) AND NOT user_agent="WordPress/*"